RREF

Requirements

1. The first nonzero entry must be a 1 in a nonzero row, called the leading 1/pivot
2. If a column as a pivot, all other entries in the column must be 0
3. All rows with pivots must contain a pivot above and to the left

• E.g.:

$$\left[\begin{array}{ccccc}0& 1& 0& 3& 5\\ 0& 0& 1& 3& 1\\ 0& 0& 0& 0& 0\end{array}\right]$$